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Is there a reason that the N value in scrypt is limited to powers of two?It turns out upon further inspection that this is not the only modification that would need to be made. The X[16] bit was an optimized version of Integrify. Without it being N being a power of two, my understanding is that this is not accurate. However, I can't quite understand the paper well enough to implement it myself and can not find a reference implementation with arbitrary N value support

Requiring a “supervisor” key pair and a “user” key pair to decrypt multiple-recipient messagesAfter pondering on this solution a while longer, I came to a bit of a stand-still. Mainly, I never want for any one person to have the complete key for unlocking the public message. Say Jim supervises over Alice and Matt. In this proposed method, the same key would potentially be encrypted with different private-keys, giving attackers a possible way in (since they know the text contained). Maybe double symetric encryption? I'm not sure